With a loop trail around one of Prescott's Granite Dells-area lakes now complete, the city and a group of volunteers have tackled the other lake in the area.Prescott Trails Specialist Chris Hosking reported this week that the long-awaited Watson Lake Loop Trail is now officially open to the public.And that sets the stage for the latest effort: The construction of a loop around Willow Lake - a project that Hosking expects to be done by September.